Metal-working machine.



No. 897,440. PATENTED SEPT.v l, 1908. B.. T. WINGO.

METAL WORKING MACHINE.

APPLIOATION PILE J 4.

D AN 16' 19 a SHEETS-SHEET 1,

PATENTED SEPT. 1, 1908.

R. T. WINGO.

.METAL WORKING MACHINE.

APPLICATION FILED JAN.16, 1904. 3 SHBBTS SHBET 2.

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n. T WINGO METAL WORKING MACHINE. APPLICATION I-ILED JAN 1r 1904 5 mmlllllil llllll UNITED STATES PATENT OFFICE.

RICHARD T. WINGO, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO BROWN AND SHARPE MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

ME TAL-WORKIN G MACHINE Specification of Letters Patent.

Patented Sept. 1, 1908.

Application filed January 16, 1904. Serial No. 189,320.

To all whom it may concern:

Be it known that I, RICHARD T. /VINGO, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Metal-Working Machines; and I do hereby declare the following specification, taken in connection with the accompanying drawings, forming a part of the same, to be a full, clear, and exact,description thereof.

The invention relates to that class' of metal working machines in which either a cutter or the work is mounted upon a reciprocating` carriage and in which the work or cutter is indexed or spaced after each cutting operation to bring the cutter and work into proper relation for the next cut. In this class of machines the reciprocating carriage is usually fed forward during the cutting operation by a slowly rotating feeding member and is quickly returned after the cut has been completed by a rapidly moving return member, the motion of the carriage being reversed at each end of its stroke by disconnecting one of these members from the carriage and connecting the other member with the carriage. The device, which is usually a clutch, for connecting and disconnecting the feed and 'return members with the carriage to reverse the movement of the carriage is usually controlled by the movement of the carriage and the indexing mechanism for changing the relation of the work and cutter after each cut is usually thrown into operation by devices on the carriage as the carriage appreaches its rearward. position. Inv this class of machines it is essential to the proper operation of the machine that the indexing be completed before the carriage is advanced to bring the cutter and work into engagement as otherwise the work or the cutter or both would be injured or ruined.

The present invention relates to devices for preventing the forward feed of the carriage in case the indexing mechanism fails to complete its movement in proper time or fails to throw out of operation at the proper time, thus insuring the properl spacing or indexing before the feeding movement of the carriage begins.

In practicing the invention I provide means for throwing the driving mechanism for the feed member out of operation during the indexing so that the feeding member remains stationary until the indexing has been completed and consequently the forward movement of the carriage cannot take place while the indexing mechanism remains in operation. I control this means for throwing the driving mechanism for the feeding member out of operation from the indexing mechanism so that the'driving mechanism is thrown out of operation whenever the indexing mechanism is thrown into operation and is again thrown into operation when the indexing mechanism comes to rest in the proper position.

In embodying the above broad features of the invention in a simple and eflicient construction well adapted for use in connection with automatic gear cutting machines, I throw the driving mechanism for the feeding member into and out of operation by means of a clutch introduced in the driving mechanism and I provide intermediate connections between the clutch and the indexing mechanism whereby the operation of the devices which start the indexing mechanism causes the disengagement of the clutch, while the return of the parts of the indexing mechanism to their normal position causes the rengagement of the clutch. The specific construction and arrangement of the parts of the mechanism for throwing the driving mechanism of the feed member into and out of operation will vary with the specific construction and arrangement Aof the other mechanismsof the machine in which. the invention is embodied.

In embodying the invention in a gear cutting machine I have employed features of invention relating more or less to details of construction which are of advantage in contrib uting to simplicity and efficiency, although not essential to the broader features of invention.

The various features and combinations constituting the invention will be understood from the following detailed description of the mechanism embodying these features shown in the accompanying drawings.

In these drawings Figure l is a side elevation of so much of an automatic gear cutting machine as is necessary to show the application of the present invention thereto. Eig. 2 is a detail partly in section showing an end view of the indexing mechanism. Fig. 3 is a detail of the index mechanism clutch, the spring being omitted. Fig. is a plan view of the machine. Fig. 5 is an end elevation with parts removed and other parts broken away and shown in section to clearly illustrate the clutch for throwing the driving mechanism for the feeding member into and out of operation. Figs. 6 and 7 are sectional details of the devices for operating this clutch.

In the construction of machine shown in the drawings a reciprocating cutter carriage A carrying a rotating cutter spindle A is mounted to reciprocate upon ways A2 in the usual manner. The carriage is moved back and forth by a screw A5 mounted to rotate in suitable ybearings and engaging a nut (not shown) on the carriage. The screw is driven to move the carriage in one direction or the other through a clutch A4 mounted to rotate with the screw but free to slide thereon. This clutch is mounted between two clutch members A5 A5 which rotate in opposite directions and at different speeds. The clutch member A5 is formed on the hubof a .wormwheel B which is driven at a slow rate of speed and in a direction to feed the carriage forward when the clutch A4 is in engagement with the clutch member A5, the worm-wheel and clutch member thus forming a feed member for feeding the cutter carriage during the cutting operation. The clutch member A0 is formed on the hub of a gear located within the casing C (Fig. 4) and driven at a high rate of speed from the pulley C in a direction to return the cutter carriage when the clutch A4 is in engagement with the clutch member A0. The clutch member A0 thus forms a return member for quickly retracting the carriage, and the clutch A4 forms a reversing device for connecting either the feed member or the return member with the carriage.

The movement of the clutch from one rotating clutch member to the other is controlled by the movement of the carriage through a shipping bar D mounted in suitable guides at the side of the machine and provided with a dog D arranged between the operating dogs D2 D3 adjustably mounted upon the carriage A. This shipping bar D is provided with two shoulders D4 arranged to act against the end D5 of a clutch operating lever D0. When the shipping bar D is moved toward the left in Figs. l and 4 by the engagement of the dog D2 with the dog D', as the carriage is being retracted, one of the shoulders D4 operates against the end D5 of the lever D0 and swings 'the end of the lever beyond the pivot D7 toward the right. During the movement of the lever D by the carriage, a pin DS on said lever moves idly in a slot E in the end of a lever F/ which is connected with the clutch A4 by means of pins engaging shoes E0 which are arranged in an annular groove in the clutch. This movement of the lever DG also forces a roll D0 on said lever over the V- sha ed end of a spring plunger D10 which yie ds to allow the passage of the roll. As the roll passes the apex of the the pin D8 reaches the end of the slot E and both the lever D0 and lever E are thrown suddenly toward-the right by the forward movement of the spring plunger thus shifting the clutch A4 from the clutch member A0 into engagement with the clutch member A5. The feed wheel B is now connected with the carriage and as it rotates feeds the carriage forward until the dog D3 strikes the dog D shifting the bar D6 toward the right. This movement of the bar D brings the opposite shoulder D4 against the end D5 of the lever D0 operating said lever to throw the clutch A4 from the clutch member A5 into engagement with the clutch member A5. Thus the carriage is moved back and forth by the return and feed members and the movement of the carriage automatically controls the shifting of the reversing clutch from one member to the other.

The indexing mechanism for spacing the work after each. cut is shown in Figs. 1 and 2. This mechanism is thrown into operation by the movement of the shipping bar D toward the left as the carriage approaches the end of its returnsroke. The bar D carries a pivoted dog F arranged to be brought into engagement with a pin F by the movement of the bar D toward the left. As this dog asses over the pin F in moving toward the eft it depresses the pin and starts the indexing mechanism into operation. 1n the drawings the parts are shown in the position which they i occupy just after the dog F hasvpassed over the pin F and before the vmovement of the bar D toward the left has continued far enough to shift the clutch A4 from the return clutch member A0 into engagement with the feed clutch member A5 and in the drawings the carriage is still moving toward the left.4 When the pin F is depressed by the dog F it engages a lug F2 projecting from an arm F3 secured to a rock shaft F4 thus rocking the arm F3 toward the right in Fig. 2. This movement of the arm F3 lifts a pin F40 carried thereby out-of engagement with shoulder F5 which is formed on a clutch member F0 of the indexing clutch. The clutch member F0 is mounted on the hub of a pinion F7 so that the clutch member rotates with the pinion but is free to slide thereon and the clutch member is forced toward a continuously rotating clutch member F8 secured to the shaft F50 by a spring F0. While the pin F40 is in engagement with the shoulder F5 it holds the clutch member F0 out of engage ment with the clutch member F8 against the tension of the spring F0 and the indexing mechanism is out of operation. When the shaft F3 is rocked as above described and the in F10 disengages the shoulder F57 the spring F0 engages the clutch member F0 with the clutch member F8 so that the pinion F7 starts to rotate. The rotation of the pinion F7 rotates a gear F101 secured upon the end of a shaft F11 the rotation of which rotates the work spindle through suitable and well known mechanisms (not shown). The rocking of the arm F3 and rock shaft F1 when the pin F is de ressed also lifts a shoe F10 carried by an arm 10 secured to said shaft out of a slot F11 formed in a flange F15 on the gear F101. When the dog F has passed the pin F the pin immediately returns to its upper position as indicated in Fig. l but the arm F3 is held in its raised position by the engagement of the shoe F10 with the flange F13. The arm F3 will therefore remain in its raised position until the slot F11 in the flange F15 comes under the shoe F10. /Vhen this occurs the arm F13 will drop down swinging the arm F3 forward so that the pin F10 will be in the path of a cam F10 on the clutch member F0. Now when the cam F10 engages the pin F10 the clutch member F0 will be moved back against the tension of the spring F0 thus disengaging the clutch and throwing the indexing mechanism out of operation. As shown the arts are so arranged that the indexing shaft 11 is given a single revolution each time the rock shaft F1 is operated by the dog F and pin F and the indexing mechanism is then thrown out of operation and remains in this condition until the shaft F1 is again rocked to throw it into operation. There is no noveltyf in this form of indexing mechanism and it is shown merely as an illustration of one type of indexing` mechanism with which the features of the invention may be employed. The construction and arrangement of the other parts of the machine already described are also such as have heretofore been used in gear cutting machines.

T will now describe the devices which I have combined with the mechanisms already described in practicing my invention.

As best shown in Fig. 5 the 'worm-wheel B is engaged and driven by a worm G loosely mounted on a stationary sleeve G. The worm G is rotated from a constantly rotating shaft G2 connected through gearing indicated at G30 with any suitable source of power. The worin G is connected with and disconnected from the shaft G2 to throw the driving mechanism for the worin-wheel B into and out of operation by means of a clutch G3 keyed to slide on the shaft G2 and provided with clutch teeth arranged to engage clutch teeth formed on the end of the worm G. The clutch G3 is moved longitudinally on the shaft G2 to throw it out of and into engagement with the worm G by means of a gear segment G1 secured to a rock shaft G1 and engaging rack teeth formed on a shoe G0. The shoe GG is mounted in an annular groove in the clutch G3 and is held from rotation and supported by a fixed yoke G7. The yoke G7 is of such width that it does not interfere with the longitudinal movement of the clutch G3. The roc-k shaft G5 is rocked in a direction to disengage the clutch G1.when the indexing mechanism is thrown into operation and is rocked in the opposite direction to engage the clutch G3 when the indexing mechanism has returned to its normal position. The connections between the shaft G5 and the indexing mechanism consist of an arm G8 o erated by the rock shaft F1 and provided) with a slot G0 engaging a crank pin G10 on the end of the shaft G5. vThe arm G8 is loosely mounted on the rock shaft F1 and is connected therewith by a lug G11 projecting into a recess G12 formed in the hub of arm G8 (Fig. l). The arm G3 is acted upon by a spring pressed plunger G13 which tends to move the arm in a direction to engage the clutch G3 with the worm G and also to hold the shoulder G11 on the hub of the arm in engagement with the lug G11.

When the shaft F1 is rocked to throw the indexing mechanism into operation the lug G11 acting against the shoulder G11 rocks the arm G8 against the tension of the spring G13 into the position indicated in the drawings, thus operating the gear segment G1 to withdraw the clutch G3 from engagement with the worm G. This disconnects the worin G from its driving shaft G2 and thus throws the driving mechanism for the feed member B out of operation. The worm-wheel B now remains at rest until the shaft F1 returns to its normal osition which can only occur when the indexing mechanism has operated properly and come into its normal position.

When the shaft F1 returns to its normal position at the end of the indexing o eration, the arm G8 is moved by the spring 13 in a direction to rengage the clutch G3 with the worm G and thus throw the driving mechanism for the worm-wheel B into operation. The recess in the hub of the arm G8 within which the lug G11 lies is of sufficient width to allow the shaft F1 to return to its normal position independently of the arm G11. This form of connection is employed between the shaft F1, and the arm G and said arm is operated by a spring to engage the clutch, so that the clutch may be properly engaged in case the edges of the teeth strike each other as the clutch is forced toward the worin G.

For convenience in the manufacture and assembling of the parts the shaft G5 which carries the pinion G1 is mounted in the eccentric bushing H. With this construction the gear segment and shaft may be mounted in the bushing and these parts introduced into `the bearing for the bushing and the .bushing then turned to bring the segment into engagement with the rack. The eccentric bushing also enables the shaft G5 to be adjusted so that the teeth of. the gear segment will mesh properly with the gear teeth on the shoe G6.

Vhat l claim as my invention and desire to secure by Letters Patent is:

1. The combination, with a carriage, of a feed-member "for advancing the carriage, a return member for retracting the carriage, driving mechanism for said feed-member, an indexing mechanism, and means for throwing said driving mechanism out of operation during the indexing, substantially as described.

2. The combination, with a carriage, of a feed member for advancing the carriage, driving mechanism therefor, an indexing mechanism, and means controlled by the indexing mechanism for throwing said driving mechanism out of operation as the indexing begins and throwing said driving mechanism into operation when the indexing is completed, substantially. as described.

. 3. The combination, with a carriage, of a feed member for advancing the carriage, a return member for retracting the carriage, a reversing device controlled by the carriage, driving mechanism for the feed member, an indexing mechanism, and means for throwing said driving mechanism out of operation during the indexing, substantially as described.

4. The combination, with a carriage, of a feed member for advancing thecarriage, a clutch for connecting the feed member with the carriage, driving mechanism for the feed member, a clutch in said driving mechanism, an indexing mechanism, and means for. disengaging said latter clutch duri-ng the indexing, substantially as described.

5. The combination, with a carriage, of a feed member for advancing the carriage, a clutch for connecting the feed member with the carriage, driving mechanism for the feed member, a clutch in said driving mechanism, an indexing mechanism, and connections between said latter clutch and indexing mechanism for controlling the engagement of the clutch, substantially as described.

6. The combination, with a carriage, of a feed member for advancing the carriage, driving mechanism therefor, a clutch in said driving mechanism, an indexing mechanism, and intermediate connections between the clutch and indexing mechanism for disengaging the clutch as the indexing starts, and reengaging the clutch as the indexing mechanism comes to normal position, substantially as described.

7. The combination, with a carriage, of a feed member, a return member, a reversing clutch for connecting either member with the carriage, an indexing mechanism, and means for throwing the driving mechanism of the n feed member into and out of operation from the indexing mechanism, substantially as described.

8. The combination, with a carriage, of a feed member, a return member, a reversing clutch for connecting either member with the carriage, an indexing mechanism, a second clutch for controlling the operation of the feed member controlled by the indexing mechanism, substantially as described.

9. The combination, with a carriage, of a feed member, a return member, a reversing clutch for connecting either member with the carriage, an indexing mechanism a second clutch for controlling the operation of the feed member, and means for throwing said latter clutch out of operation during the in dexing, substantially as described.

10. The combination, with a carriage, of a feed member therefor, an indexing mechanism, a clutch for controlling the operation of the feed member, connections between the clutch and indexing mechanism for disengaging said clutch as the indexing begins, and engaging said clutch as the indexing is completed, substantially as described.

11. The combination, with a carriage, of a feed member, a clutch for connecting the feed member with the carriage, an indexing mechanism, a clutch for controlling the operation of the feed member, means for disengaging said clutch at the beginning of the indexing and engaging said latter clutch at the completion of the indexing, substantially as described.

12. The combination, with a carriage, of a feed member therefor, a clutch through which said member-is driven, an indexing mechanism, a controlling device for the indexing-mechanism, and connections between said device and clutch for disengaging and engaging said clutch, substantially as de scribed.

13. The combination, with a carriage, of a feed member therefor, a clutch through which said member is driven, an indexing mechanism, a trip for starting and stopping the index mechanism, and connections between said trip and clutch for disengaging and engaging said clutch, substantially as described.

14. The combination, with a carriage, of a feed member therefor, a return member therefor, a clutch throughvwhich said feed member is driven, an indexing mechanism, a rock shaft operated in opposite directions at the beginning and end of the indexing, and connections between said shaft and clutch, substantially -as described.

RICHARD T-.- WINGO.

Witnesses:

W. H, THURsToN, J. H. THUnsroN. 

